php数据结构之顺序链表与链式线性表示例

本文实例讲述了php数据结构之顺序链表与链式线性表。分享给大家供大家参考，具体如下：

链表操作

1、     initlist(l)：初始化链表
2、     destroylist(l)：删除连接
3、     clearlist(l)：清空链表
4、     listempty(l)：判断是否为空
5、     listlength(l)：链表长度
6、     getelem(l,i)：取出元素
7、     locateelem(l,e)：判断e是否在链表中
8、     priorelem(l,i)：前驱
9、     nextelem(l,i)：后继
10、   listinsert(l,i,e)：插入元素
11、   listdelete(l,i,)：删除元素

顺序链表操作

<?php
class arraylist{
  private $list;
  private $size;
  //构造函数
  public function __construct(){
   $this->list=array();
   $this->size=0;
  }
  public function initlist(){
   $this->list=array();
   $this->size=0;
  }
  //删除链表
  public function destorylist(){
   if(isset($this->list)){
     unset($this->list);
    $this->size=0;
   }
  }
  //清空链表
  public function clearlist(){
   if(isset($this->list)){
    unset($this->list);
   }
   $this->list=array();
   $this->size=0;
  }
  //判断链表是否为空
  public function emptylist(){
   if(isset($this->list)){
     if($this->size=0)
      return true;
    else
     return false;
   }
  }
  //链表长度
  public function lenghtlist(){
   if(isset($this->list)){
    return $this->size;
   }
  }
  //取元素
  public function getelem($i){
   if($i<1||$i>$this->size){
    echo "溢出<br>";
    exit();
   }
   if(isset($this->list)&&is_array($this->list)){
    return $this->list[$i-1];
   }
  }
  //是否在链表中
  public function locateelem($e){
   if(isset($this->list)&&is_array($this->list)){
    for($i=0;$i<$this->size;$i++){
      if($this->list[$i]==$e){
       return $i+1;
      }
    }
    return 0;
   }
  }
  //前驱
  public function priorelem($i){
   if($i<1||$i>$this->size){
    echo "溢出";
    exit();
   }
   if($i==1){
    echo "没有前驱";
    exit();
   }
   if(isset($this->list)&&is_array($this->list)){
    return $this->list[$i-2];
   }
  }
  //后继
  public function nextelem($i){
   if($i<1||$i>$this->size){
    echo "溢出";
    exit();
   }
   if($i==$this->size){
    echo "没有后继";
    exit();
   }
   if(isset($this->list)&&is_array($this->list)){
    return $this->list[$i];
   }
  }
  //插入元素
  public function insertlist($i,$e){
   if($i<1||$i>$this->size+1){
    echo "插入元素位置有误";
    exit();
   }
   if(isset($this->list)&&is_array($this->list)){
    if($this->size==0){
      $this->list[$this->size]=$e;
      $this->size++;
    }else{
      $this->size++;
      for($j=$this->size-1;$j>=$i;$j--){
       $this->list[$j]=$this->list[$j-1];
      }
      $this->list[$i-1]=$e;
    }
   }
  }
  //删除元素
  public function deletellist($i){
   if($i<1||$i>$this->size){
    echo "删除元素位置有误";
    exit();
   }
   if(isset($this->list)&&is_array($this->list)){
    if($i==$this->size){
      unset($this->list[$this->size-1]);
    }else{
      for($j=$i;$j<$this->size;$j++){
       $this->list[$j-1]=$this->list[$j];
      }
      unset($this->list[$this->size-1]);
     }
   $this->size--;
   }
  }
  //遍历
  public function printlist(){
   if(isset($this->list)&&is_array($this->list)){
    foreach ($this->list as $value){
      echo $value." ";
    }
    echo "<br>";
   }
  }
}
?>

链式线性表

<?php
class linklist {
  private $head;
  private $size;
  private $list;
  public function __construct(){
   $this->head="";
   $this->size=0;
   $this->list=array();
  }
  public function initlist(){
   $this->head="";
   $this->size=0;
   $this->list=array();
  }
  //删除链表
  public function destorylist(){
   if(isset($this->list)&&isset($this->head)){
    unset($this->list);
    unset($this->head);
   }
  }
  //清空链表
  public function clearlist(){
   if(isset($this->list)){
    unset($this->list);
   }
   $this->list=array();
   $this->size=0;
   $this->head="";
  }
  //判断链表是否为空
  public function emptylist(){
   if(isset($this->list)){
    if($this->size==0)
      returntrue;
    else
      returnfalse;
   }
  }
  //链表长度
  public function lenghtlist(){
   if(isset($this->list)){
    return$this->size;
   }
  }
  //取元素
  public function getelem($i){
   if($i<1||$i>$this->size){
    echo "溢出<br>";
    exit();
   }
   if(isset($this->list)&&is_array($this->list)){
    $j=1;
    //头指针
    $tmp=$this->head;
    while($i>$j){
      if($this->list[$tmp]['next']!=null){
       $tmp=$this->list[$tmp]['next'];
       $j++;
      }
    }
    return  $this->list[$tmp]['data'];
   }
  }
  //是否在链表中
  public function locateelem($e){
   if(isset($this->list)&&is_array($this->list)){
    $tmp=$this->head;
    while($this->list[$tmp]['data']!=$e){
      if($this->list[$tmp]['next']!=null){
       $tmp=$this->list[$tmp]['next'];
      }else{
       returnfalse;
      }
    }
    return true;
   }
  }
  //前驱
  public function priorelem($i){
   if($i<1||$i>=$this->size){
    echo "溢出";
    exit();
   }
   if($i==1){
    echo "没有前驱";
    exit();
   }
   $tmp=$this->head;
   $j=1;
   while($i>$j+1){
    if($this->list[$tmp]['next']!=null){
      $j++;
      $tmp=$this->list[$tmp]['next'];
    }
   }
   return$this->list[$tmp]['data'];
  }
  //后继
  public function nextelem($i){
   if($i<1||$i>$this->size){
    echo "溢出";
    exit();
   }
   if($i==$this->size){
    echo "没有后继";
    exit();
   }
   $j=1;
   $tmp=$this->head;
   while($i>=$j){
    if($this->list[$tmp]['next']!=null){
      $j++;
      $tmp=$this->list[$tmp]['next'];
    }
   }
   return$this->list[$tmp]['data'];
  }
  //插入元素:后插法
  public function insertlist($i,$e){
   if(isset($this->list)&&is_array($this->list)){
    //空表
    if($this->size==0){
      $this->head=$this->uuid();
      $this->list[$this->head]['data']=$e;
      $this->list[$this->head]['next']=null;
      $this->size++;
    }else{
      if($i<1||$i>$this->size){
      echo"插入元素位置有误";
      exit();
      }
      $j=1;
      $tmp=$this->head;
      while($i>$j){
       if($this->list[$tmp]['next']!=null){
         $j++;
         $tmp=$this->list[$tmp]['next'];
       }
      }
      $find=$tmp;
      $id=$this->uuid();
      if($this->list[$find]['next']==null){
       //尾部
       $this->list[$find]['next']=$id;
       $this->list[$id]['data']=$e;
       $this->list[$id]['next']=null;
       $this->size++;
      }else{
       //中间
       $this->list[$id]['next']=$this->list[$find]['next'];
       $this->list[$find]['next']=$id;
       $this->list[$id]['data']=$e;
       $this->size++;
      }
    }
   }
  }
  //删除元素
  public function deletellist($i){
   if($i<1||$i>$this->size){
    echo "删除元素位置有误";
    exit();
   }
   if(isset($this->list)&&is_array($this->list)){
    if($i==1){
      //删除头元素
      $this->head=$this->list[$this->head]['next'];
    }else{
      $tmp=$this->head;
      $j=1;
      while($i>$j+1){
       if($this->list[$tmp]['next']!=null){
         $j++;
         $tmp=$this->list[$tmp]['next'];
       }
      }
      //找到删除元素的前驱
      $find=$tmp;
      //删除的元素
      if($this->list[$find]['next']!=null){
       //不是最后一个元素
       $delete=$this->list[$find]['next'];
       $this->list[$find]['next']=$this->list[$delete]['next'];
      }else{
       $this->list[$tmp]['next']=null;
      }
    }
   }
  }
  public function traverstlist(){
   $tmp=$this->head;
   while($this->list[$tmp]['next']!=null){
    $this->printlist($this->list[$tmp]['data'],true);
    $tmp=$this->list[$tmp]['next'];
   }
   $this->printlist($this->list[$tmp]['data'],false);
  }
  public function printlist($str,$flag){
   if($flag){
    echo$str."->";
   }else {
    echo$str."<br>";
   }
  }
  //uuid 唯一码
  public  function uuid($prefix = '') {
  $chars =md5(uniqid(mt_rand(), true));
  $uuid = substr($chars,0,8) . '-';
  $uuid .=substr($chars,8,4) . '-';
  $uuid .=substr($chars,12,4) . '-';
  $uuid .=substr($chars,16,4) . '-';
  $uuid .= substr($chars,20,12);
  return $prefix. $uuid;
  }
}
?>

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